The name Elizabeth "Thomas" comes from a 1815 Llangynog marriage record between John Jones and Elizabeth Thomas that now doesn't work very well. The 1815 Llangynog Elizabeth Thomas/John Jones marriage is illogical because: Our John Jones and Elizabeth are both too old to be married with "consent of parents" which is, by law, under 21 (they would have been in their 30s.); John Jones could sign his name on the marriage record, although, he is illiterate on at least four other signed records; and John and Elizabeth already had at least two children (David, b. 1811 and Margaret, b. 1813.) The 1815 marriage better fits the birth years, literacy and circumstances of the other John/Elizabeth Jones family listed on Llangynog's 1841 and 1851 censuses.
I accept Marilyn's arguments. Finding several women named "Elizabeth" married to men named John Jones in Carmarthenshire between 1808 and 1815, we are left with the task of determining who is the correct one. But while most of the marriage records include no occupation for the groom (including the record with Elizabeth Thomas). the marriage record for Elizabeth Treharn and John Jones, dated 10 November 1808, gives John's occupation as a mason. He is also listed as a mason in the christening records for most of their children.
|John Jones & Elizabeth Treharn Marriage record, 1808|
My Ancestry tree (HistoryMax Family Tree) has Elizabeth Trehern as John's wife; Elizabeth Thomas is not listed as an alternative choice.